Mass Effect 3 Insanity trophy glitch?

I have had two of my friends play and beat ME3 on insanity and they both did not unlock the trophy for doing so. I was wondering if anyone else has dealt with this problem too? I am also about to jump into insanity and try and get my last trophy for the platinum but I don't want to get the same problem of not unlocking the trophy.

"I'm not a failure because I didn't win, I'm a failure because I didn't try." - Kev